• Asian Pacific Journal of Cancer Prevention
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• 제13권10호
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• pp.4873-4878
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• 2012

Apoptosis is programmed cell death which is essential for development and survival of living organisms. It is a sequentially regulated suicidal programme where cells activate certain enzymes which dissolute their own nuclear component and various protein component of nucleus and cytoplasm. Disturbance of this regulatory pathway may lead to various diseases like autoimmune diseases, neurodegenerative diseases and cancers. The potential mechanisms of apoptosis and its role in cancer are discussed. The ability of apoptosis to modulate the life or death of a cell is also recognized for its immense therapeutic potential. Understanding the mechanisms from this review will give us better insight to the pathogenesis of various diseases including cancer and will open new horizons to therapeutic approaches.

• International Journal of Oral Biology
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• 제35권3호
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• pp.113-119
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• 2010

Porphyromonas (P.) gingivalis lipopolysaccharide (Pg LPS) is the major pathogenic component of periodontal disease. In this study, we have attempted to determine the expression profiles of the signal transduction pathway genes induced by Pg LPS in comparison with Escherichia (E.) coli LPS (Ec LPS). DC2.4 cells were treated for two hours with $1\;{\mu}g/ml$ of Pg LPS or $0.5\;{\mu}g/ml$ of Ec LPS. The total RNA from these cells was then isolated and reverse-transcribed. Gene expression profiles were then analyzed with a signal transduction pathway finder GEArray Q series kit and significant changes in expression were confirmed by real-time PCR. The microarray results indicated that several genes, including Tnfrsf10b, Vcam1, Scyb9, Trim25, Klk6, and Stra6 were upregulated in the DC2.4 cells in response to Pg LPS treatment, but were downregulated or unaffected by Ec LPS. Realtime PCR revealed that the expression of Trim25, Scyb9 and Tnfrsf10b was increased over the untreated control. Notably, Trim25 and Tnfrsf10b were more strongly induced by Pg LPS than by Ec LPS. These results provide greater insight into the signal transduction pathways that are altered by P. gingivalis LPS.

• International Journal of Oral Biology
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• 제45권4호
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• pp.143-151
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• 2020

Streptococcus mutans and Streptococcus sobrinus play important roles in dental caries. Coptis chinensis is a natural product with antimicrobial activity against enterobacteria; however, its effects on oral streptococci are still unknown. Therefore, the effects of C. chinensis on the growth and biofilm formation of the representative cariogenic bacteria S. mutans and S. sobrinus were investigated for the possible use of C. chinensis as an anticaries agent. The C. chinensis extract was diluted with sterile distilled water, and 0.1-2.5% of the extract was used in the experiment. The effects of the C. chinensis extract on the growth and glucan formation of S. mutans and S. sobrinus were measured by viable cell counting and spectrophotometry at 650 nm absorbance, respectively. Crystal violet staining was also carried out to confirm the C. chinensis extract's inhibitory effect on biofilm formation. The C. chinensis extract significantly inhibited the growth of S. mutans and S. sobrinus at concentrations of ≥ 0.3% as compared with the control group. The viable cell count of colonies decreased by 1.7-fold and 1.2-fold at 2.5% and 1.25%, respectively, compared with the control group. The biofilm formation of S. mutans and S. sobrinus was inhibited by > 20-fold at C. chinensis extract concentrations of ≥ 1.25% as compared with the control group. In summary, the C. chinensis extract inhibited the growth and biofilm and glucan formation of S. mutans and S. sobrinus. Therefore, C. chinensis might be a potential candidate for controlling dental caries.

• International Journal of Oral Biology
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• 제39권3호
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• pp.131-136
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• 2014

Porphyromonas gingivalis is one of the most important periodontal pathogens and has been to known to invade various types of cells, including endothelial cells. The present study investigated the mechanisms involved in the internalization of P. gingivalis in human umbilical vein endothelial cells (HUVEC). P. gingivalis internalization was reduced by clathrin and lipid raft inhibitors, as well as a siRNA knockdown of caveolin-1, a principal molecule of lipid raft-related caveolae. The internalization was also reduced by perturbation of actin rearrangement, while microtubule polymerization was not required. Furthermore, we found that Src kinases are critical for the internalization of P. gingivalis into HUVEC, while neither Rho family GTPases nor phosphatidylinositol 3-kinase are required. Taken together, this study indicated that P. gingivalis internalization into endothelial cells involves clathrin and lipid rafts and requires actin rearrangement associated with Src kinase activation.

• 미생물학회지
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• 제53권3호
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• pp.222-224
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• 2017

Prevotella intermedia는 그람 음성이면서, 절대 혐기성, 비스포아형성 및 운동성 간균이다. P. intermedia는 사람의 구강내 정상세균총의 하나이며, 치주질환, 임신성 치은염, 급성괴사성궤사성 치은염, 치근관 감염, 및 류마티성 관절염과 관련이 있다. P. intermedia KCOM 1107 (= ChDC KB29) 균주가 사람 치은염 병소 치은연하 치면세균막에서 분리되었다. P. intermedia KCOM 1107 균주 유전체 염기서열을 해독하여 보고한다.

• 미생물학회지
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• 제53권3호
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• pp.225-226
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• 2017

Streptococcus mitis는 그람 양성이면서, 통성 혐기성, 알파-용혈성 및 비운동성 구균이다. S. mitis는 인후, 비인두 및 구강내 정상세균총의 하나이고, 감염성 심내막염, 폐혈증 및 뇌수막염과 연관이 있다. KCOM 1350 (= ChDC B183) 균주가 사람 하악골 골수염 병소에서 분리되었다. S. mitis KCOM 1350 균주 유전체 염기서열을 해독하여 보고한다.

• 미생물학회지
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• 제53권2호
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• pp.126-128
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• 2017

Cutibacterium acnes (이전 학명 = Propionibacterium acnes)은 혐기성, 그람 양성 간균으로 사람 피부 및 점막조직 표면의 정상 세균총에 해당할 뿐만 아니라 여드름, 유육종증, 뇌종양, 심내막염, 전립선암, 치주질환 및 치수감염질환과도 연관성이 있는 것으로 보고되고 있다. C. acnes KCOM 1861 (= ChDC B594) 균주가 사람 악골 골수염 병소에서 분리되었으며 그 유전체 염기서열을 해독하여 보고한다.

• 미생물학회지
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• 제53권4호
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• pp.334-336
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• 2017

Porphyromonas gingivalis는 그람 음성이면서, 절대 혐기성 및 비운동성 간균이다. P. gingivalis는 치주염 및 치근관 감염의 원인균일 뿐만 아니라, 동맥경화증, 조산 및 알츠하이머 질환과 같은 전신질환과도 연관성이 있다. P. gingivalis KCOM 2797 (= JS2) 균주가 사람 치주염 병소에서 분리되었다. P. gingivalis KCOM 2797 균주의 유전체 염기서열을 해독하여 보고한다.

• International Journal of Oral Biology
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• 제46권3호
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• pp.111-118
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• 2021

Periodontitis and periimplantitis are caused as a result of dental biofilm formation. This biofilm is composed of multiple species of pathogens. Therefore, controlling biofilm formation is critical for disease prevention. To inhibit biofilm formation, sugars can be used to interrupt lectin-involving interactions between bacteria or between bacteria and a host. In this study, we evaluated the effect of D-Arabinose on biofilm formation of putative periodontal pathogens as well as the quorum sensing activity and whole protein profiles of the pathogens. Crystal violet staining, confocal laser scanning microscopy, and scanning electron microscopy revealed that D-Arabinose inhibited biofilm formation of Porphyromonas gingivalis, Fusobacterium nucleatum, and Tannerella forsythia. D-Arabinose also significantly inhibited the activity of autoinducer 2 of F. nucleatum and the expression of representative bacterial virulence genes. Furthermore, D-Arabinose treatment altered the expression of some bacterial proteins. These results demonstrate that D-Arabinose can be used as an antibiofilm agent for the prevention of periodontal infections.

• 미생물학회지
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• 제55권1호
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• pp.52-54
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• 2019

Dialister pneumosintes는 그람 음성이면서, 혐기성, 비발효성 및 막대 모양의 세균이다. D. pneumosintes는 치주질환병원성세균으로 알려져 있다. D. pneumosintes KCOM 1685 (= ChDC B414) 균주가 수술후상악동낭종 병소에서 분리되었다. D. pneumosintes KCOM 1685 균주 유전체 염기서열을 해독하여 보고한다.